Recurrent & Persistent Papillary Thyroid Cancer Central Nodal Dissection vs. Node-Picking Patterns of Nodal Metastases Recurrent Laryngeal Nerve,
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1 Recurrent & Persistent Papillary Thyroid Cancer Central Nodal Dissection vs. Node-Picking Patterns of Nodal Metastases Recurrent Laryngeal Nerve, Larynx, Trachea, & Esophageal Management Robert C. Wang, MD, FACS University of Nevada School of Medicine
2 Recurrent & Persistent Papillary Thyroid Ca Low cancer mortality More initially.less recurrence + more complications Less initially..more recurrence I 131 TSH suppression..recurrence..recurrence..recurrence
3 T Staging TX: Primary tumor cannot be assessed T0: No evidence of primary tumor T1: Primary tumor diameter < 2 cm T2: Primary tumor diameter > 2 cm but < 4 cm T3: Primary tumor > 4 cm T4a: Tumor of any size extending beyond the thyroid capsule to invade subcutaneous fat, larynx, trachea, esophagus, or recurrent laryngeal nerve T4b: Tumor invades prevertebral fascia, or encases carotid artery or mediastinal i vessels
4 N Staging NX: Regional lymph nodes cannot be assessed N0: No regional lymph node metastasis N1a: Metastases to Level VI (paratracheal, pretracheal, prelaryngeal/delphian nodes) N1b: Metastasis in unilateral, bilateral, or contralateral lateral cervical or mediastinal nodes
5 Recurrent & Persistent Papillary Thyroid Ca Locoregional recurrence is the most challenging problem in thyroid papillary ca Extent of thyroidectomy: y in 900 < 1cm PTC over 60 years (Hay ID et al, 2008), 23% multifocal, 12% bilateral, with recurrence (20 yr) 5.5% for bilateral vs. 9.8% for unilateral surgery (NS), in contralat lobe or soft tissues
6 Recurrent & Persistent Papillary Thyroid Ca 52,173 PTC database study (Bilimoria et al, 2007): < 1 cm, no difference between lobectomy or total thyroidectomy cm, 24% more recurrence, 49% more cancer mortality in lobectomy vs. total thyroidectomy y > 1cm, 15% more recurrence, 31% more cancer mortality
7 Recurrent & Persistent Papillary Thyroid Ca 33,088 DTC pts had 46% greater cancer- specific deaths in > age 45 group w/ nodal mets vs. without (Zaydfudin V et al, 2008) Number of positive nodes correlates w/ recurrence and DM (Leboulleux S et al, 2005) Preop ultrasound sensitivity low (<50%) due to inability to show micrometastases (Ito Y et al, 2006)
8 Recurrent & Persistent Papillary Thyroid Ca Compartmental prophylactic nodal dissections may reduce recurrence (Scheumann GF eta, al, 1994; Bonnet etseta, al, 2009) but may increase risk of injury to RLN and parathyroid glands Liberal use of auto-transplantation esp. in secondary central dissections(clayman G et al, 2009)
9 Recurrent & Persistent Papillary Thyroid Ca Differences from nodal patterns with SCCa
10 Recurrent & Persistent Papillary Thyroid Ca Medial to carotid sheath, retro-trachealtracheal
11 Recurrent & Persistent Papillary Thyroid Ca Deep to carotid sheath
12 Recurrent & Persistent Papillary Thyroid Ca Structures at risk in dissecting medial and deep to carotid sheath Internal and external branches of superior laryngeal n. Superior thyroid artery (superior PTH supply) Vagus n. Sympathetic plexus Thoracic duct Phrenic n. Pleura
13 Recurrent & Persistent Papillary Thyroid Ca Massive neck metastasis, nodal mets in superficial inferior midline adipose tissue
14 Recurrent & Persistent Papillary Thyroid Ca Massive neck metastasis
15 Recurrent & Persistent Papillary Thyroid Ca 50-75% papillary ca are I 131 avid, decreases with ihage RAI for <10 mm tumors, efficacy in reducing recurrences questioned (Hay ID et al, 2008) 115 pts < 2 cm ca, 37% central, 23% lateral p,, occult nodal metastasis (Bonnet S et al, 2009)
16 Recurrent & Persistent Papillary Thyroid Ca Level II-B not involved unless II-A grossly positive, V-A Anever erinvolved, in53(43 recurrent) clinically obvious lateral neck disease (Farrag T et al, 2009) Ultrasound accurate for detecting nodal recurrences: 90% sensitive, ii 78% specific, 94% positive predictive value (Stulak JM et al, 2006)
17 Central Nodal Dissection vs. Node-Picking Retrospective review of last 50 patients with thyroid cancer w/o clinical nodal mets 45 women 5 men Average age 50 Node-picking 23 ( ) Central dissection 27 ( ) 2009)
18 Overall Yield of Positive Nodes Total Positive nodes (%) Node-picking 23 7 (30%) Central Dissection (67%) P<.05
19 <1cm Cancers Yield of Positive Nodes Total % with positive nodes Node-picking 12 2 (17%) Central Dissection 7 4 (57%) P<.05
20 >1cm Cancers Yield of Positive Nodes Total % with positive nodes Node-Picking 11 5 (45%) Central Dissection (70%) P<.05
21 Number of Positive Nodes Method Overall <1cm >1cm p=.002 p=.05 p=.007 Node Picking Central Dissxn
22 6 month non-stimulated Thyroglobulin levels, excluding T4 and known DM Node picking: 80% undetectable Nodal dissection: 100% undetectable
23 Delphian Node Predictive Value Positive Predictive Value for Central node involvement 7/7 (100%) Negative Predictive Value 18/26 (69%)
24 Recurrent Laryngeal Nerve Surgical Management Resection of frln may worsen hoarseness & aspiration despite preop fixed cord due to loss of remaining i innervation Resection of anterior branch of RLN causes fixation of cord, but relatively good voice without aspiration
25 Recurrent Laryngeal Nerve Surgical Management Shave of RLN for margins may result in no noticeable loss of function Extrapolating from facial n, stretch injury of < 10% is significant, as is crush or electrical trauma
26 Recurrent Laryngeal Nerve Surgical Management Immediate vs. delayed arytenoid adduction or thyroplasty Interposition nerve grafting Isolate RLN high as it enters larynx in thyroidectomy w/o preop cancer diagnosis i to facilitate secondary central nodal dissection
27 Papillary Ca Invading Thyroid Cartilage and Cricothyroid Membrane
28 Papillary Ca Invading Thyroid Cartilage and Cricothyroid Membrane
29 Papillary Ca Invading Thyroid Cartilage and Cricothyroid Membrane
30 Papillary Ca Invading Membranous Trachea and Esophagus Allograft to repair trachea
31 Papillary Ca Invading Trachea Segmental resection & end to end anastomosis
32 Residual Papillary Ca Invading Esophagus -Hypopharynx & upper esophagus involved to superior mediastinum -Lateral matted nodal mets -IJV compressed/occluded -Morbidly obese
33 Residual Papillary Ca Invading Esophagus -RLN resected at entry into larynx -Esophageal wall bulging after muscularis resection -On regular diet -Still morbidly obese
34 Neck Incision for Thyroidectomy and Modified RND
35 Robotic assisted thyroidectomy Transaxillary approach No neck incisions Cannot perform superior mediastinal dissection or pyramidal lobe resection to hyoid bone Lateral neck dissection possible
36 References Mazzaferri, Ernest I: What is the optimal initial treatment of low risk papillary thyroid cancer (and why is it controversial)? Oncology 23(7):579-88, Revised American Thyroid Association management guidelines for patients with thyroid nodules and differentiated thyroid cancer. Thyroid 19(11):1-48,
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